Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 20)

17
Diagnostics
Service Codes Summary (continued)
2 Terrain Lights on
Solid or DDM –
Dashes "--" Code No. Causes (numbered in order of likely occurrence)
Deflate Signal 11, 12, 16 INCORRECT DEFLATE PRESSURE: Deflate signal reads outside of configured range
for 30 seconds. If occurs during multi-channel deflate, system will reattempt deflates
on individual channels.
Repair and request pressure check to clear. (any mode button or run flat).
1) Faulty PCU relief valve
2) Leaking upper control lines
3) PCU internal leaks
4) Deflate solenoid poppet stuck in non-energized position
5) Poor ground connection to PCU sensor or faulty sensor
No Terrain Lights or
DDM – Dashes "--" Code No. Causes (numbered in order of likely occurrence)
PCU Solenoid 51, 52, 54,
55, 56 ELECTRICAL SOLENOID FAILURE (System non-operative): Solenoid fails electrical
diagnostics for approximately 2 seconds.
Repair & cycle ignition to clear.
1) Solenoid or harness wire is shorted to ground
2) Solenoid or harness wire is shorted to power
3) Faulty solenoid
No Terrain Lights or
DDM – Blank Display Code No. Causes (numbered in order of likely occurrence)
Power 17 POWER (System non-operative): After initialization, voltage drops below 18V for > 15
seconds.
Clears immediately when voltage > = 18V.
1) Low battery voltage
2) Poor ground connection to ECU
3) Poor power connection to ECU
DDM – Dashes "--" Code No. Causes (numbered in order of likely occurrence)
Display Control
Communications 75 NO COMMUNICATION TO DDM: ECU not receiving data from DDM user interface.
Repair to clear.
1) No data link connection to DDM (damaged harness wiring)
2) Faulty DDM